[Test-Equipment] HP-334A

[Dale H. Cook]

At 10:03 PM 11/25/2007, DW Holtman wrote:

>I recently acquired a HP-334A. It works in the Voltmeter mode. In 
>the distortion mode, it will not null. The balance knobs or main 
>frequency dial has no effect on trying to null the unit.
>
>Does anybody have any suggestions on where is a good place to start 
>trouble shooting?

If you don't have the manual, download the PDF from the Agilent site:

http://www.home.agilent.com/agilent/redirector.jspx?action=ref&cname=AGILENT_EDITORIAL&ckey=811981&lc=eng&cc=US&nfr=-11143.0.00

See the troubleshooting table on page 5-13, symptom C.

On the A6 bridge balance board are five lamps (DS1 - DS5) coupled to 
five photocells (V1 - V5). I would think DS1 might be bad.

Dale H. Cook, Chief Engineer, Centennial Broadcasting, 
Roanoke/Lynchburg, VA - WZZI / WZZU / WLNI / WLEQ
http://members.cox.net/dalehcook/starcity.shtml